Compressor of Vehicle&#39;s Cooling System

ABSTRACT

A compressor of the vehicle&#39;s cooling system is configured such that an external refrigerant is introduced into a shaft in a radial direction through a body, flows in the shaft in an axial direction, and then is discharged to a refrigerant compression space in the body, thereby shortening the flow path of the refrigerant and minimizing flow path resistance. Moreover, since no suction valves and suction chambers are required, the structure is simplified and the cost is reduced.

CROSS-REFERENCE TO RELATED APPLICATION

The present application claims priority to Korean Patent Application No.10-2008-0094304, filed on Sep. 25, 2008, the entire contents of which isincorporated herein for all purposes by this reference.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a compressor of a vehicle's coolingsystem, and more particularly, to a compressor of a vehicle's coolingsystem which can minimize flow resistance of a refrigerant in thecompressor and increase compression efficiency, and further can improvethe performance of an air conditioner.

2. Description of Related Art

Generally, a vehicle's cooling system circulates a refrigerant by usinga compressor, a condenser, an expander, and an evaporator, and cools airin the interior of the vehicle by using an evaporative latent heat ofthe refrigerant. That is, the refrigerant is heat-exchanged with the airof the vehicle interior as it passes through the evaporator, therebycooling the interior of the vehicle and changing to a low temperaturelow pressure gas state. This refrigerant of the low temperature lowpressure gas state changes to a high temperature high pressure gas statein the compressor, and then is heat-exchanged with air outside thevehicle as it passes through the condenser and changes to a hightemperature high pressure liquid state, and then changes to a lowtemperature low pressure liquid state as it passes through the expanderand is moved back to the evaporator.

Among them, the compressor also functions as a driving source forallowing the refrigerant to circulate, as well as compressing therefrigerant. Thus, the compression efficiency of the refrigerant in thecompressor significantly affects the performance of the vehicle'scooling system.

FIG. 1 is a cross sectional view showing a compressor of a vehicle'scooling system according to the prior art.

Referring to FIG. 1, the compressor of the vehicle's cooling systemaccording to the prior art comprises a cylindrical body 1, covers 2 and3 coupled with the body 1 to seal the refrigerant, and valve plates 4and 5 disposed opposite sides of the body 1.

A storage space 1 a for storing the refrigerant entering and exiting thebody 1 is formed in the body 1, a compression space 1 b for compressingthe refrigerant is formed, spaced apart inward from the storage space 1a, a shaft 6 is rotatably disposed in the compression space 1 b,horizontally penetrating the compression space 1 b, a swash plate 7 isrotatably coupled to an outer surface of the shaft 6 so as to berotatable along with the shaft 6 in a circumferential direction, and apiston 8 for compressing the refrigerant to be filled in the compressionspace is coupled to the swash plate 7.

The swash plate 7 is obliquely formed so as to receive rotational forceof the shaft 6 and reciprocate the piston 8, and the piston 8reciprocates in the compression space 1 b in company with the rotationof the swash plate 7 to thus compress the refrigerant filled in thecompression space 1 b.

The covers 2 and 3 comprise a front cover 2 disposed at the front sideof the body 1 and a rear cover 3 disposed at the rear side of the body1. Suction chambers 2 a and 3 a, which are a space for introducing arefrigerant from the storage space 1 a of the body 1, and dischargechambers 2 b and 3 b, which are a space for discharging the refrigerantback to the storage space 1 a after introduction of compressedrefrigerant from the compression space 1 b, are respectively formed onthe front cover 2 and the rear cover 3. Although not shown, a holethrough which the refrigerant can move is formed in the body 1, thestorage space 1 a of the body 1 and the suction chambers 2 a and 3 acommunicate with each other through this hole, and the storage space 1 aof the body 1 and the discharge chambers 2 b and 3 b of the covers 2 and3 also communicate with each other.

A pulley 9 connected to the shaft 6 to transfer rotational force to theshaft 6 is disposed on an outer side of the front cover 2, and thepulley 9 has grooves 9 a for mounting a belt transferring the rotationalforce from the engine thereon.

Valve plates 4 and 5 are disposed between the front side of the body 1and the front cover 2 and between the rear side of the body 1 and therear cover 3, respectively. The valve plates 4 and 5 have suctionopenings 4 a and 5 a for sucking a low temperature low pressurerefrigerant from the suction chambers 2 a and 3 a to the compressionspace 1 b and discharge openings 4 b and 5 b for discharging arefrigerant sucked into the compression space 1 b and compressed at ahigh temperature and high pressure to the discharge chambers 2 b and 3b.

The valve plates 4 and 5 are provided with suction valves in the suctionopenings 4 a and 5 a. The suction valves are opened only during thesuction stroke of the piston 8 to suck a low temperature low pressurerefrigerant from the suction chambers 2 a and 3 a to the compressionspace 1 b and closed by pressure during the discharge stroke of thepiston 8, thereby preventing a high temperature high pressurerefrigerant from leaking into the suction chambers 2 a and 3 a from thecompression space 1 b.

Further, the valve plates 4 and 5 are provided with discharge valves inthe discharge holes 4 b and 5 b. The discharge valves are opened onlyduring the discharge stroke of the piston 8 to discharge a hightemperature high pressure refrigerant from the compression space 1 b tothe discharge chambers 2 b and 3 b and closed by pressure during thesuction stroke of the piston 8, thereby preventing a low temperature lowpressure refrigerant from leaking into the discharge chambers 2 b and 3b from the compression space 1 b.

The operation of the thus-constructed compressor of the vehicle'scooling system according to the prior art will be discussed below.

A low temperature low pressure refrigerant introduced into the storagespace 1 a via an entrance hole during the suction stroke of the piston 8is moved to the suction chambers 2 a and 3 a, and then is sucked intothe compression space 1 b via the suction openings 4 a and 5 a formed inthe valve plates 4 and 5 and compressed by the compression stroke of thepiston 8. Next, the refrigerant is discharged to the discharge chambers2 b and 3 b via the discharge openings 4 b and 5 b formed on the valveplates 4 and 5 during the discharge stroke of the piston 8, and thenintroduced into the storage space 1 a and discharged to a condenser viaan exit hole.

The information disclosed in this Background of the Invention section isonly for enhancement of understanding of the general background of theinvention and should not be taken as an acknowledgement or any form ofsuggestion that this information forms the prior art already known to aperson skilled in the art.

BRIEF SUMMARY OF THE INVENTION

Various aspects of the present invention are directed to provide acompressor of a vehicle's cooling system which can minimize flowresistance of a refrigerant in the compressor and increase compressionefficiency, and further can improve the performance of an airconditioner.

In an aspect of the present invention, the compressor of a vehicle'scooling system may include a body formed to introduce a refrigerant fromthe outside in a radial direction thereof, and a shaft rotatably coupledto the body and formed such that the refrigerant introduced into thebody enters into the shaft in the radial direction thereof, flows in anaxial direction thereof, and then exits in the radial direction thereoftoward a refrigerant compression space formed in the body.

A body refrigerant inlet hole may be formed on a circumferential surfaceof the body so as to introduce the refrigerant from the outside into theshaft in the radial direction of the body.

A refrigerant flow path may be formed in the shaft so as to move therefrigerant in the axial direction thereof.

At least a portion of the shaft may be formed in a hollow shape, one endof which is closed.

Shaft refrigerant inlet holes for allowing the refrigerant introducedinto the body to enter into the shaft and shaft refrigerant outlet holesfor discharging the refrigerant introduced to the inside of the shaft tothe refrigerant compression space of the body may be respectively formedon a circumferential surface of the shaft in the radial directionthereof.

The shaft refrigerant inlet holes and the shaft refrigerant outlet holesmay be spaced with a predetermined angle therebetween in a rotationaldirection of the shaft.

The shaft refrigerant inlet holes may be formed substantially in amiddle portion of the shaft and the shaft refrigerant outlet holes aredisposed at forward and rearward sides from the shaft refrigerant inletholes.

The shaft refrigerant inlet holes and the shaft refrigerant outlet holesmay be formed in plural number, respectively.

A first boss portion to which the shaft is axially coupled is formed ata central portion of the body, and body refrigerant outlet holescommunicating with the shaft refrigerant outlet holes and fordischarging the refrigerant coming from the shaft to the refrigerantcompression space may be formed in a second boss portion of the body,wherein the body refrigerant outlet holes are formed in a directioninclined at a predetermined angle from a longitudinal axis of the shafttoward the distal ends of the body.

Front and rear surfaces of the refrigerant compression space of the bodymay be respectively opened, and front and rear heads for guiding thecompressed refrigerant coming from the refrigerant compression space tothe outside are coupled to the opened front and rear surfacesrespectively, wherein discharge valves for controlling discharge of therefrigerant are installed between the refrigerant compression space andthe front and rear heads.

A swash plate may be axially coupled to the shaft, and a swash platerefrigerant inlet hole communicating with the shaft refrigerant inletholes is formed on the swash plate so as to guide the refrigerantintroduced into the body to the shaft, wherein the shaft refrigerantinlet holes and the swash plate refrigerant inlet hole are disposed on astraight line in the radial direction of the shaft, wherein the swashplate includes a first boss portion axially coupled to the shaft and adisc portion formed in a circumferential direction of the first bossportion and disposed at an inclination inside the body, and the swashplate refrigerant inlet hole is formed in the first boss portion, andwherein a piston for compressing the refrigerant in the refrigerantcompression space while moving back and forth according to rotation ofthe shaft is coupled to the disc portion of the swash plate.

At least a portion of the shaft may be formed in a hollow shape, ofwhich one end is closed and an additional inlet hole for guiding therefrigerant not introduced to the shaft refrigerant inlet holes isformed at the other end of the shaft.

In another aspect of the present invention, a compressor of a vehicle'scooling system may include a body having a body refrigerant inlet holeformed therein to introduce a refrigerant from the outside in a radialdirection thereof, a shaft rotatably disposed in the body and havingshaft refrigerant inlet holes and shaft refrigerant outlet holes, theshaft refrigerant inlet holes for introducing the refrigerant introducedvia the body refrigerant inlet hole and the shaft refrigerant outletholes for discharging the refrigerant introduced to the inside of theshaft toward a refrigerant compression space formed in the body in aradial direction of the shaft, a swash plate axially coupled to theshaft and having a swash plate refrigerant inlet hole communicating withthe shaft refrigerant inlet hole, a piston coupled to one side of theswash plate and linearly reciprocating in the body during rotation ofthe shaft, and front and rear heads respectively installed on openedfront and rear surfaces of the body and for discharging the compressedrefrigerant coming from the refrigerant compression space to theoutside.

A refrigerant flow path may be formed in the shaft so as to move therefrigerant in an axial direction thereof.

Body refrigerant outlet holes communicating with the shaft refrigerantoutlet holes may be formed in the body for discharging the refrigerantcoming from the shaft to the refrigerant compression space.

In various aspects of the present invention, the compressor of thevehicle's cooling system according to the present invention isconfigured such that an external refrigerant is introduced into a shaftin a radial direction through a body, flows in the shaft in an axialdirection, and then is discharged to a refrigerant compression space inthe body, thereby shortening the flow path of the refrigerant andminimizing flow path resistance. Since no suction valves and suctionchambers are required, the structure is simplified and the cost isreduced.

The methods and apparatuses of the present invention have other featuresand advantages which will be apparent from or are set forth in moredetail in the accompanying drawings, which are incorporated herein, andthe following Detailed Description of the Invention, which togetherserve to explain certain principles of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a cross sectional view showing a compressor of a vehicle'scooling system according to the prior art.

FIG. 2 is a cross sectional view showing a compressor of a vehicle'scooling system according to an exemplary embodiment of the presentinvention.

FIG. 3 is a cutaway perspective view showing a compressor of a vehicle'scooling system according to an exemplary embodiment of the presentinvention.

FIG. 4 is a perspective view of a body shown in FIG. 3.

FIG. 5 is a perspective view of a swash plate shown in FIG. 3.

FIG. 6 is a perspective view of a shaft shown in FIG. 3.

It should be understood that the appended drawings are not necessarilyto scale, presenting a somewhat simplified representation of variousfeatures illustrative of the basic principles of the invention. Thespecific design features of the present invention as disclosed herein,including, for example, specific dimensions, orientations, locations,and shapes will be determined in part by the particular intendedapplication and use environment.

In the figures, reference numbers refer to the same or equivalent partsof the present invention throughout the several figures of the drawing.

DETAILED DESCRIPTION OF THE INVENTION

Reference will now be made in detail to various embodiments of thepresent invention(s), examples of which are illustrated in theaccompanying drawings and described below. While the invention(s) willbe described in conjunction with exemplary embodiments, it will beunderstood that present description is not intended to limit theinvention(s) to those exemplary embodiments. On the contrary, theinvention(s) is/are intended to cover not only the exemplaryembodiments, but also various alternatives, modifications, equivalentsand other embodiments, which may be included within the spirit and scopeof the invention as defined by the appended claims.

FIG. 2 is a cross sectional view showing a compressor of a vehicle'scooling system according to an exemplary embodiment of the presentinvention, FIG. 3 is a cutaway perspective view showing a compressor ofa vehicle's cooling system according to an exemplary embodiment of thepresent invention, FIG. 4 is a perspective view of a body shown in FIG.3, FIG. 5 is a perspective view of a swash plate shown in FIG. 3, andFIG. 6 is a perspective view of a shaft shown in FIG. 3.

Referring to FIGS. 2 to 6, the compressor of the vehicle's coolingsystem according to an exemplary embodiment of the present inventioncomprises a body 50 forming a refrigerant compression space 51 forcompressing a refrigerant therein, a front head 60 and a rear head 62disposed respectively on the opened front and rear surfaces of the body50, a shaft 70 disposed to penetrate the body 50, a swash plate 80axially coupled to the shaft 70, and a piston 90 coupled to one side ofthe swash plate 80.

The body 50 includes a manifold portion 55 having a suction port 52 anda discharge port 54 for introducing and discharging a refrigerant.

Furthermore, the body 50 has a body refrigerant inlet hole 56 formedsuch that the refrigerant introduced through the suction port 52 isintroduced in a radial direction to the shaft 70.

The refrigerant compression space 51 for compressing a refrigerant bythe piston 90 is formed in the body 50. The refrigerant compressionspace 51 is disposed to be spaced apart inward from the manifold portion55. The refrigerant compression space 51 is defined by the piston 90 andthe front and rear heads 60 and 62.

The body 50 is formed so as to be opened at the front and rear surfaces,the front surface of the body 50 is disposed to be covered by the fronthead 60, and the rear surface of the body 50 is disposed to be coveredby the rear head 62.

Discharge chambers 63 and 64 for discharging the refrigerant compressedin the refrigerant compression space 51 are formed on the front head 60and the rear head 62, respectively. The discharge chambers 63 and 64 areformed so as to communicate with the manifold portion 55, and thereforethe refrigerant discharged to the discharge chambers 63 and 64 isdischarged to the outside through the discharge port 54 of the manifoldportion 55.

A front discharge valve sheet 65 for controlling discharge of therefrigerant compressed in the refrigerant compression space 51 isdisposed between the front surface of the body 50 and the front head 60.A front discharge valve 66 is provided on the front discharge valvesheet 65.

A rear discharge valve sheet 67 is disposed between the rear surface ofthe body 50 and the rear head 62. A rear discharge valve 68 is providedon the rear discharge valve sheet 67.

The front discharge valve 66 and the rear discharge valve 68 may beconfigured so as to be opened in a direction in which the refrigerant isdischarged by a discharge pressure of the refrigerant.

In an exemplary embodiment of the present invention, because therefrigerant introduced into the body 50 in the radial direction isconfigured so as to be directly introduced to the shaft 70, all of thesuction chambers and suction valves of the prior art may be omitted.

Referring to FIG. 2, the shaft 70 is formed such that the refrigerantintroduced to the body 50 is introduced thereinto in the radialdirection, flows therein in an axial direction, and then exists in theradial direction toward the refrigerant compression space 51. That is, arefrigerant flow path 71 is formed in the shaft 70 so as to move therefrigerant in the axial direction. The shaft 70 is opened at the rearend and formed in a hollow shape to thus form the refrigerant flow path71 therein.

Referring to FIGS. 2 to 6, shaft refrigerant inlet holes 72 and 73 areformed on the circumferential surface of the shaft 70 to allow therefrigerant introduced into the body 50 to enter into the shaft 70.

The shaft refrigerant inlet holes 72 and 73 may be formed in pluralnumber. The following description will be given of a case where twoshaft refrigerant inlet holes 72 and 73 are formed at positions spacedapart at a predetermined angle along the circumferential surface of theshaft 70.

Further, the rear end portion of the shaft 70 is opened, and thereforehas an additional inlet hole 74 through which the refrigerant notintroduced to the shaft refrigerant inlet holes 72 and 73, among therefrigerant in the body 50, can be introduced into the shaft 70.

A guide groove portion 69 for guiding the refrigerant in the body 50 tothe additional inlet hole 74 may be formed on the rear head 62.

Further, shaft refrigerant outlet holes 75, 76, and 77 for dischargingthe refrigerant introduced to the inside and flowing in an axialdirection to the refrigerant compression space 51 are formed on thecircumferential surface of the shaft 70.

The shaft refrigerant outlet holes 75, 76, and 77 may be formed inplural number. The following description will be given of a case wherethe shaft refrigerant outlet holes 75, 76, and 77 are disposed at frontand rear sides with respect to the shaft refrigerant inlet holes 72 and73.

In addition, the shaft refrigerant outlet holes 75, 76, and 77 may beformed in plural number at positions spaced apart at a predeterminedangle along the circumferential direction at the front and rear sides ofthe shaft 70. The shaft refrigerant outlet holes 75, 76, and 77 may beformed in a slot shape.

Meanwhile, a second boss portion 57 to which the shaft 70 is axiallycoupled is formed at a central portion of the body 50, and bodyrefrigerant outlet holes 58 and 59 communicating with the shaftrefrigerant outlet holes 75, 76, and 77 are formed in the boss portion57. The body refrigerant outlet holes 58 and 59 may be respectivelyinclined at a predetermined angle toward the ends, i.e, forward andbackward, of the body 50.

The swash plate 80 is disposed at an inclination so as to receiverotational force of the shaft 70 and reciprocate the piston 90.

The swash plate 80 comprises a first boss portion 81 axially coupled tothe shaft 70 and a disc portion 82 formed in a circumferential directionof the first boss portion 81 and disposed at an inclination inside thebody 50.

The swash plate 80 has a swash plate refrigerant inlet hole 83communicating with the shaft refrigerant inlet holes 72 and 73. Theswash plate refrigerant inlet hole 83 is formed in the first bossportion 81, and communicates with the shaft refrigerant inlet holes 72and 73.

Since the swash plate refrigerant inlet hole 83, along with the shaftrefrigerant inlet holes 72 and 73, is disposed on a straight line, flowpath resistance can be minimized.

The flow of a refrigerant in the thus-constructed compressor of thevehicle's cooling system according to an exemplary embodiment of thepresent invention will be discussed below.

First, a refrigerant from the outside is introduced to the manifoldportion 55 via the body refrigerant inlet hole 56 in a radial direction.

The refrigerant introduced into the body 50 sequentially passes throughthe swash plate refrigerant inlet hole 83 and the shaft refrigerantinlet holes 72 and 73, and enters into the shaft 70.

That is, a suction path of refrigerant is configured such that arefrigerant sequentially passes through the body refrigerant inlet hole56, the swash plate refrigerant inlet hole 83, and the shaft refrigerantinlet holes 72 and 73 and then enters into the shaft 70.

Such a suction path of refrigerant is formed in a radial directionperpendicular to an axial direction and is nearly a straight line, andhence suction path resistance can be minimized.

Further, since no suction chambers or suction valves are required, thecost can be reduced.

Moreover, the refrigerant not passed through the shaft refrigerant inletholes 72 and 73, among the refrigerant introduced to the body 50, may beintroduced into the shaft 70 via the guide groove portion 69 of the rearhead 62 and the additional inlet hole 74 of the shaft 70.

Meanwhile, the refrigerant introduced into the shaft 70 flows forwardand backward of the shaft 70. The refrigerant flowing forward andbackward of the shaft 70 sequentially passes through the shaftrefrigerant outlet holes 75, 76, and 77 and the body refrigerant outletholes 58 and 59, and then is released to the refrigerant compressionspace 51 of the body 50.

The refrigerant released to the refrigerant compression space 51 fromthe inside of the shaft 70 is compressed by the reciprocation of thepiston 90.

The refrigerant compressed in the refrigerant compression space 51passes through the discharge valves 66 and 68 and the discharge chambers63 and 64, and then is discharged through the discharge port 54.

Accordingly, with the above-described configuration of the refrigerantflow path, suction valves and suction chambers can be omitted, and flowpath resistance can be minimized, thereby improving compressionefficiency and performance.

For convenience in explanation and accurate definition in the appendedclaims, the terms “front”, “rear”, “inside”, “inner”, and “outer” areused to describe features of the exemplary embodiments with reference tothe positions of such features as displayed in the figures.

The foregoing descriptions of specific exemplary embodiments of thepresent invention have been presented for purposes of illustration anddescription. They are not intended to be exhaustive or to limit theinvention to the precise forms disclosed, and obviously manymodifications and variations are possible in light of the aboveteachings. The exemplary embodiments were chosen and described in orderto explain certain principles of the invention and their practicalapplication, to thereby enable others skilled in the art to make andutilize various exemplary embodiments of the present invention, as wellas various alternatives and modifications thereof. It is intended thatthe scope of the invention be defined by the Claims appended hereto andtheir equivalents.

1. A compressor of a vehicle's cooling system comprising: a body formedto introduce a refrigerant from the outside in a radial directionthereof; and a shaft rotatably coupled to the body and formed such thatthe refrigerant introduced into the body enters into the shaft in theradial direction thereof, flows in an axial direction thereof, and thenexits in the radial direction thereof toward a refrigerant compressionspace formed in the body.
 2. The compressor of claim 1, wherein a bodyrefrigerant inlet hole is formed on a circumferential surface of thebody so as to introduce the refrigerant from the outside into the shaftin the radial direction of the body.
 3. The compressor of claim 1,wherein a refrigerant flow path is formed in the shaft so as to move therefrigerant in the axial direction thereof.
 4. The compressor of claim1, wherein at least a portion of the shaft is formed in a hollow shape,one end of which is closed.
 5. The compressor of claim 1, wherein shaftrefrigerant inlet holes for allowing the refrigerant introduced into thebody to enter into the shaft and shaft refrigerant outlet holes fordischarging the refrigerant introduced to the inside of the shaft to therefrigerant compression space of the body are respectively formed on acircumferential surface of the shaft in the radial direction thereof. 6.The compressor of claim 5, wherein the shaft refrigerant inlet holes andthe shaft refrigerant outlet holes are spaced with a predetermined angletherebetween in a rotational direction of the shaft.
 7. The compressorof claim 5, wherein the shaft refrigerant inlet holes are formedsubstantially in a middle portion of the shaft and the shaft refrigerantoutlet holes are disposed at forward and rearward sides from the shaftrefrigerant inlet holes.
 8. The compressor of claim 5, wherein the shaftrefrigerant inlet holes and the shaft refrigerant outlet holes areformed in plural number, respectively.
 9. The compressor of claim 5,wherein a first boss portion to which the shaft is axially coupled isformed at a central portion of the body, and body refrigerant outletholes communicating with the shaft refrigerant outlet holes and fordischarging the refrigerant coming from the shaft to the refrigerantcompression space are formed in a second boss portion of the body. 10.The compressor of claim 9, wherein the body refrigerant outlet holes areformed in a direction inclined at a predetermined angle from alongitudinal axis of the shaft toward the distal ends of the body. 11.The compressor of claim 1, wherein front and rear surfaces of therefrigerant compression space of the body are respectively opened, andfront and rear heads for guiding the compressed refrigerant coming fromthe refrigerant compression space to the outside are coupled to theopened front and rear surfaces respectively.
 12. The compressor of claim11, wherein discharge valves for controlling discharge of therefrigerant are installed between the refrigerant compression space andthe front and rear heads.
 13. The compressor of claim 1, wherein a swashplate is axially coupled to the shaft, and a swash plate refrigerantinlet hole communicating with the shaft refrigerant inlet holes isformed on the swash plate so as to guide the refrigerant introduced intothe body to the shaft.
 14. The compressor of claim 13, wherein the shaftrefrigerant inlet holes and the swash plate refrigerant inlet hole aredisposed on a straight line in the radial direction of the shaft. 15.The compressor of claim 13, wherein the swash plate comprises a firstboss portion axially coupled to the shaft and a disc portion formed in acircumferential direction of the first boss portion and disposed at aninclination inside the body, and the swash plate refrigerant inlet holeis formed in the first boss portion.
 16. The compressor of claim 14,wherein a piston for compressing the refrigerant in the refrigerantcompression space while moving back and forth according to rotation ofthe shaft is coupled to the disc portion of the swash plate.
 17. Thecompressor of claim 5, wherein at least a portion of the shaft is formedin a hollow shape, of which one end is closed and an additional inlethole for guiding the refrigerant not introduced to the shaft refrigerantinlet holes is formed at the other end of the shaft.
 18. A compressor ofa vehicle's cooling system comprising: a body having a body refrigerantinlet hole formed therein to introduce a refrigerant from the outside ina radial direction thereof; a shaft rotatably disposed in the body andhaving shaft refrigerant inlet holes and shaft refrigerant outlet holes,the shaft refrigerant inlet holes for introducing the refrigerantintroduced via the body refrigerant inlet hole and the shaft refrigerantoutlet holes for discharging the refrigerant introduced to the inside ofthe shaft toward a refrigerant compression space formed in the body in aradial direction of the shaft; a swash plate axially coupled to theshaft and having a swash plate refrigerant inlet hole communicating withthe shaft refrigerant inlet hole; a piston coupled to one side of theswash plate and linearly reciprocating in the body during rotation ofthe shaft; and front and rear heads respectively installed on openedfront and rear surfaces of the body and for discharging the compressedrefrigerant coming from the refrigerant compression space to theoutside.
 19. The compressor of claim 18, wherein a refrigerant flow pathis formed in the shaft so as to move the refrigerant in an axialdirection thereof.
 20. The compressor of claim 18, wherein bodyrefrigerant outlet holes communicating with the shaft refrigerant outletholes are formed in the body for discharging the refrigerant coming fromthe shaft to the refrigerant compression space.